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Anode active substance for lithium ion battery and preparation method thereof

A positive electrode active material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost, insufficient stability, high synthesis temperature, etc., improve specific capacity and cycle performance, and improve electrochemical performance. performance effect

Inactive Publication Date: 2014-07-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials such as Co and Ni used in this type of material are relatively expensive, the synthesis temperature is high, and the stability of the material in the cycle process is not good enough.

Method used

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  • Anode active substance for lithium ion battery and preparation method thereof
  • Anode active substance for lithium ion battery and preparation method thereof
  • Anode active substance for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 2.9113gLi 2 CO 3 , 7.1576gMn (NO 3 ) 2Dissolve 0.0314g LiF in 10ml of deionized water to form a salt solution. Dissolve 12.6718g of citric acid in 10ml of deionized solution and add it to the aforementioned salt solution to form a mixed solution. Adjust the pH of the mixed solution to 8 with ammonia water, and then place the mixed solution on a magnetic heating Stirring was continued at a constant temperature of 60° C. on the stirrer for 8 hours to obtain a liquid precursor. Place the liquid precursor in a drying oven at 80°C for 16 hours, then dry at 150°C for 12 hours to obtain a solid precursor, place the solid precursor in a muffle furnace and calcinate at 500°C for 3 minutes, then grind it into a powder Precursor, heat the powdery precursor at 300°C for one hour and then heat it to 600°C at a heating rate of 2°C / min for 12h to obtain fluorine-doped Li 2 MnO 3 (Li 2 MnO 2.97 f 0.03 ).

[0028] The same method as Comparative Example 1 was used to prepa...

Embodiment 2

[0030] Weigh 5.3505gLiNO 3 , 4.5980gMnCO 3 And 0.0629gLiF was dissolved in 8ml deionized water to form a salt solution, 25.3435g citric acid was dissolved in 30ml deionized water and added to the aforementioned salt solution to form a mixed solution, the pH of the mixed solution was adjusted to 7 with ammonia water, and then the mixed solution was placed on a magnetic Stir continuously for 6 hours at a constant temperature of 80° C. on a heating stirrer to obtain a liquid precursor. Place the liquid precursor in a drying oven at 80°C for 24 hours, then dry at 130°C for 8 hours to obtain a solid precursor, place the solid precursor in a muffle furnace and calcinate at 500°C for 5 minutes, then grind it into a powder Precursor, heat the powdery precursor at 300°C for one hour and then heat it to 700°C at a heating rate of 4°C / min for 9h to obtain fluorine-doped Li 2 MnO 3 (Li 2 MnO 2.94 f 0.06 ).

[0031] The same method as Comparative Example 1 was used to prepare CR2025...

Embodiment 3

[0033] Weigh 5.2778gLiNO 3 , 6.9211gMn(CH 3 COO) 2 and 0.0943g LiF dissolved in 20ml of deionized water to form a salt solution, 38.0153g of citric acid was dissolved in 30ml of deionized water and added to the aforementioned salt solution to form a mixed solution, the pH of the mixed solution was adjusted to 9 with ammonia water, and then the mixed solution was placed on a magnetic Stir continuously for 6 hours at a constant temperature of 80° C. on a heating stirrer to obtain a liquid precursor. Place the liquid precursor in a drying oven at 80°C for 16 hours, then dry at 150°C for 8 hours to obtain a solid precursor, place the solid precursor in a muffle furnace and calcinate at 450°C for 7 minutes, then grind it into a powder Precursor, heat the powdery precursor at 300°C for 2 hours and then heat it to 600°C at a heating rate of 3°C / min for 15h to obtain fluorine-doped Li 2 MnO 3 (Li 2 MnO 2.91 f 0.09 ).

[0034] The same method as Comparative Example 1 was used t...

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Abstract

The invention provides an anode active substance for a lithium ion battery and a preparation method thereof. The anode active substance is fluorine-doped Li2MnO3; the composition formula is Li2MnO3-xFx and x is more than or equal to 0.03 and less than or equal to 0.12. The preparation method is simple; according to the battery produced by the preparation method, the first-time specific discharge capacity is 172.4-209.1mAh / g when the current density is 5mA / g, and keeps 112.7-139.9mAh / g after 20 times of cycles; the retention rate is 58.6-66.9%.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a positive electrode active material for a lithium ion battery and a preparation method thereof. Background technique [0002] With the depletion of fossil fuels and the rapid development of portable electronic devices and electric vehicles, the research on new energy sources such as power source batteries has become the focus of global attention. Excellent characteristics such as long time, no memory effect, less environmental pollution, fast charging, and long cycle life have been widely used. Lithium-ion battery structure mainly includes pole core and non-aqueous electrolyte, and described pole core and non-aqueous electrolyte are sealed in the battery case, and described pole core comprises positive pole, negative pole and the separator between positive pole and negative pole, and described The positive electrode includes a current collector and a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/62H01M4/131H01M10/0525
CPCH01M4/1315H01M4/362H01M4/505H01M4/62H01M10/0525Y02E60/10
Inventor 余志勇吴莎刘韩星王壮郑振宁孙念
Owner WUHAN UNIV OF TECH
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